Ingredients

• 6 cups cubed seeded watermelon
• 1/2 red onion, cut into thin half-moon slices
• 1/3 cup apple cider vinegar
• 2 tablespoons chopped fresh mint, or more to taste
• 1/2 teaspoon ground black pepper

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Instructions

1. Toss watermelon, red onion, apple cider vinegar, mint, and black pepper together in a large mixing bowl. Refrigerate until chilled completely, about 1 hour.